508969381 has 4 divisors (see below), whose sum is σ = 511099200. Its totient is φ = 506839564.

The previous prime is 508969327. The next prime is 508969463. The reversal of 508969381 is 183969805.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183969805 = 5 ⋅36793961.

It is a cyclic number.

It is not a de Polignac number, because 508969381 - 2¹⁵ = 508936613 is a prime.

It is a super-2 number, since 2×508969381² = 518099661591046322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (508969301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064551 + ... + 1065028.

It is an arithmetic number, because the mean of its divisors is an integer number (127774800).

Almost surely, 2^508969381 is an apocalyptic number.

It is an amenable number.

508969381 is a deficient number, since it is larger than the sum of its proper divisors (2129819).

508969381 is a wasteful number, since it uses less digits than its factorization.

508969381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129818.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 508969381 is about 22560.3497534945. The cubic root of 508969381 is about 798.4184279520.

The spelling of 508969381 in words is "five hundred eight million, nine hundred sixty-nine thousand, three hundred eighty-one".